code: def _lambdacode(self, printer):
      return "lambda"
  
imports: from sympy.concrete.summations import Sum
  from sympy.core.expr import Expr
  from sympy.core.symbol import symbols
  from sympy.functions.elementary.miscellaneous import sqrt
  from sympy.functions.elementary.piecewise import Piecewise
  from sympy.functions.elementary.trigonometric import sin
  from sympy.matrices.dense import MutableDenseMatrix
  from sympy.sets.sets import Interval
  from sympy.utilities.lambdify import lambdify
  from sympy.testing.pytest import raises
  from sympy.printing.tensorflow import TensorflowPrinter
  from sympy.printing.lambdarepr import lambdarepr, LambdaPrinter, NumExprPrinter
label_desc: Use image node_id 1 for calling the CustomPrintedObject obj's underlying member method code with example usage: obj._lambdacode(printer) and returns: str